PARALLEL & TAPER KEY DIMENSIONS AND TOLERANCES PER ANSI B17.1-1967 (R1998)

Parallel - taper keys and keyseats sizes, types and tolerances according to ANSI B17.1-1967 standard. The sizes and tolerances contained in ANSI B17.1 standard are intended for single key applications only.

ANSI standard recognizes that there are two classes of stock for parallel keys. One is a broad negative toleranced bar stock and the other is a close plus toleranced keystock.

Parallel - Taper Keys and Keyseats:

INPUT PARAMETERS
Key Type	Parallel Key Taper Key
Key Cross Section	Square Rectangular
Stock Class	Bar Stock Keystock
Nominal Key Size Width [over - to (incl.)]	Up to 3/4 3/4 to 1-1/2 1-1/2 to 2-1/2 2-1/2 to 3-1/2

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RESULTS
Parameter			Value
Key Type			---	---
Key Cross Section			---
Stock Class			---
Nominal Key Size Width [over - to (incl.)] (W)			---	inch
Width	Plus Tolerance	Wtol	---
	Minus Tolerance		---
Height	Plus Tolerance	Htol	---
	Minus Tolerance		---

Definitions:

Bar Stock: General purpose, negative toleranced, cold finished steel stock for parallel keys.

Keystock: A close plus toleranced, cold finished steel stock for parallel keys.

Sunk Key: A standard form of key with rectangular or square cross-section in which the key fits into the keyseats on the shaft and the hub.

Reference:

• Oberg, E. , Jones ,F.D. , Horton H.L. , Ryffel H.H., (2016) . Machinery's Handbook . 30th edition.  Industrial Press Inc.
• Oberg, E. , Jones ,F.D. , Horton H.L. , Ryffel H.H., (2012) . Machinery's Handbook . 29th edition.  Industrial Press Inc.
• ANSI B17.1-1967, Keys and Keyseats